A Weapon used in MW2 and other Call of Duty games. They called it this because people got pissed off at people shooting with these weapons at them.
Minecraft isn't FPS ( It's a sandbox). There is none.
An under barrel grenade launcher attachment on an assault rifle. They call it a "noobtube" because "noobs" use it and it is shaped like a tube. I use them for fun and call them protubes.
Challenge: "Ouch" - Kill an enemy with a rifle-mounted grenade launcher without detonation. (Direct impact)
You select it as a killstreak. you need 25 kills (without dying ofc). Then you end the game with it. Simple as ever. Now go and nuke some noobs! (don't use noobtube)